JP6892838B2 - Acoustic output device and acoustic output method - Google Patents

Description

The present invention relates to a technique of vibrating a touch panel to output sound.

Patent Document 1 discloses an acoustic output device (input / output device) that vibrates a display panel with a touch panel (touch pad) to output sound. The acoustic output device described in FIGS. 11 and 20 of Patent Document 1 has a function of vibrating a display panel with a touch panel to output sound (acoustic output function) and a function of detecting pressing into the display panel with a touch panel (acoustic output function). Push-in detection function) and can be executed at the same time.

JP 2013-162167 (Claim 6, paragraph 0020, FIG. 11, FIG. 20)

When the acoustic output function and the push detection function are executed at the same time, the detection accuracy of the push detection function may decrease due to the vibration of the acoustic output function. Further, when the operator operates the display panel with the touch panel while the acoustic output function is being executed, the operator may be given a strange tactile sensation due to the vibration of the acoustic output function.

In paragraphs 0063-0066 of Patent Document 1, a circuit configuration for avoiding a decrease in the pressing detection accuracy in the pressing detection function due to vibration of the acoustic output function is disclosed. However, in the circuit configuration, noise cannot be canceled by using the acoustic signal when the acoustic output function and the push detection function are being executed at the same time, so that the press detection accuracy in the push detection function is maintained at a good level. Is difficult.

In view of the above problems, it is an object of the present invention to provide an acoustic output technique capable of reducing giving an operator a feeling of strangeness due to vibration of an acoustic output function.

The acoustic output device according to the present invention has a touch panel, a vibrator that generates vibration based on an acoustic signal in the touch panel to generate sound, and a period during which contact of an operating body with the touch panel is detected by the touch panel. , A control unit for controlling the acoustic signal, and a configuration (first configuration).

In the acoustic output device of the first configuration, the control unit has a configuration (second configuration) of controlling the acoustic signal even during a period in which the proximity of the operating body to the touch panel is detected by the touch panel. There may be.

In the acoustic output device having the first or second configuration, the control unit may have a configuration (third configuration) for controlling at least reducing the first band of the acoustic signal.

In the acoustic output device having the third configuration, the first band may be a band having an upper limit of 500 Hz or less (fourth configuration).

In the acoustic output device having any of the first to fourth configurations, the control unit may have a configuration (fifth configuration) that controls at least to amplify the second band of the acoustic signal.

In the acoustic output device having the fifth configuration, the second band may have a configuration (sixth configuration) that does not include a band having an upper limit of 500 Hz or less.

In the acoustic output device having any of the first to sixth configurations, the pressure detection unit that detects the pressure applied to the touch panel and the output signal of the pressure detection unit are the opposite phase signal of the acoustic signal or the acoustic signal. A configuration (seventh configuration) may include a superimposing portion for superimposing an anti-phase signal of the corrected acoustic signal obtained by correction.

In the acoustic output device having the seventh configuration, the superimposing unit superimposes an antiphase signal of the corrected acoustic signal on the output signal of the pressure detecting unit, and the corrected acoustic signal is relative to the acoustic signal. The signal may be a signal obtained by performing correction according to the vibration characteristics of the touch panel (eighth configuration).

The acoustic output device having any of the first to eighth configurations may be configured to include a display panel facing the touch panel (nineth configuration).

The acoustic output method according to the present invention is an acoustic output method using a touch panel, in which a vibration step of generating vibration based on an acoustic signal on the touch panel to generate sound and contact of an operating body with the touch panel are described above. It is a configuration (tenth configuration) including a control step for controlling the acoustic signal during the period detected by the touch panel.

According to the acoustic output technique of the present invention, it is possible to reduce giving the operator a feeling of strangeness due to the vibration of the acoustic output function.

The figure which shows the configuration example of the acoustic output device Flow chart showing an operation example of the acoustic output device Timing chart schematically showing waveform examples of various signals The figure which shows the frequency characteristic which a tactile receptor of a human finger has The figure which shows an example of the vibration characteristic of the display panel with a touch panel The figure which shows an example of the frequency characteristic of a correction gain Flowchart showing other operation examples of the acoustic output device Timing chart schematically showing waveform examples of various signals

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings.

<1. Configuration example of acoustic output device>
FIG. 1 is a diagram showing a configuration example of an acoustic output device. The acoustic output device shown in FIG. 1 includes a microcomputer 1, a DSP (Digital Signal Processor) 2, a drive circuit 3, a piezoelectric element 4, a display panel 5, a touch panel 6, a subtractor 7, and a filter circuit 8. And a push-in detection circuit 9. The display panel P1 with a touch panel includes a display panel 5 and a touch panel 6. The display panel 5 and the touch panel 6 face each other.

The acoustic output device shown in FIG. 1 has a function of vibrating a display panel P1 with a touch panel to output sound (acoustic output function), a function of detecting a push on a display panel P1 with a touch panel (push detection function), and, for example, a touch panel. It has a function (tactile feedback function) of returning a response by vibrating tactile sensation to an operating body such as an operator's finger or a touch pen when a push or the like with respect to the attached display panel P1 is detected.

The microprocessor 1 controls the entire acoustic output device shown in FIG. The microcomputer 1 includes a CPU (Central Processing Unit), a memory, and the like as hardware. The microcomputer 1 includes an acoustic signal output unit 1a, a tactile feedback signal output unit 1b, a video signal output unit 1c, and an operation processing unit 1d as functions realized by software.

The acoustic signal output unit 1a outputs the acoustic signal SG1 to the DSP2. The acoustic signal SG1 may be generated by the acoustic signal output unit 1a itself, or may be acquired by the acoustic signal output unit 1a from the outside of the microcomputer 1.

The tactile feedback signal output unit 1b generates a tactile feedback signal SG2 based on the processing result of the operation processing unit 1d, and outputs the tactile feedback signal SG2 to the drive circuit 3.

The video signal output unit 1c outputs the video signal SG3 to the display panel 5. The video signal SG3 may be generated by the video signal output unit 1c itself, or may be acquired by the video signal output unit 1c from the outside of the microcomputer 1.

The operation processing unit 1d recognizes the input operation based on the detection signal SG8 output from the touch panel 6 and the detection signal SG11 output from the push detection circuit 9, and executes the processing according to the input operation. For example, when the input operation is a push to the display panel 5, the operation processing unit 1d instructs the tactile feedback signal output unit 1b to generate and output the tactile feedback signal SG2.

The DSP2 can change the sound quality of the sound output from the sound output device shown in FIG. 1 by executing various signal processes on the sound signal SG1. For example, DSP2 has an equalizer function that changes the frequency characteristics of an acoustic signal. The DSP2 executes various signal processing on the acoustic signal SG1, converts the acoustic signal SG1 into the acoustic signal SG4, and outputs the acoustic signal SG4 to the drive circuit 3.

Further, the DSP 2 generates a noise canceling acoustic signal SG5 based on the acoustic signal SG1 and outputs the noise canceling acoustic signal SG5 to the subtractor 7. The details of the noise canceling acoustic signal SG5 will be described later.

The drive circuit 3 includes a first D / A converter, a second D / A converter, a superimposition circuit, and an amplifier. Unlike the present embodiment, the first D / A converter may be provided on the microcomputer 1 side so that the drive circuit 3 receives the tactile feedback signal SG2 which is an analog signal. Further, unlike the present embodiment, a second D / A converter may be provided on the DSP2 side so that the drive circuit 3 receives the acoustic signal SG4 which is an analog signal.

The first D / A converter of the drive circuit 3 converts the tactile feedback signal SG2, which is a digital signal, into an analog signal. The second D / A converter of the drive circuit 3 converts the acoustic signal SG4, which is a digital signal, into an analog signal. The superimposition circuit of the drive circuit 3 superimposes the analog signal output from the first D / A converter of the drive circuit 3 on the analog signal output from the second D / A converter of the drive circuit 3 to generate a superimposition analog signal. ..

When the acoustic signal SG1 is output from the microcomputer 1 but the tactile feedback signal SG2 is not output, the superimposed analog signal is equivalent to the analog signal output from the second D / A converter of the drive circuit 3. Become. Further, when the tactile feedback signal SG2 is output from the microcomputer 1 but the acoustic signal SG1 is not output, the superimposed analog signal is equivalent to the analog signal output from the first D / A converter of the drive circuit 3. Become. Further, when neither the acoustic signal SG1 nor the tactile feedback signal SG2 is output from the microcomputer 1, the superimposed analog signal becomes no signal.

The amplifier of the drive circuit 3 amplifies the superimposed analog signal generated by the superimposed circuit of the drive circuit 3 to generate the drive signal SG6, and outputs the drive signal SG6 to the piezoelectric element 4.

The piezoelectric element 4 is, for example, a piezo element. The number of the piezoelectric elements 4 may be singular or plural. The piezoelectric element 4 is arranged on the back surface of the display panel 5 (the surface opposite to the operator side) and is fixed to the display panel P1 with a touch panel. In the present embodiment, the piezoelectric element 4 is fixed to the back surface of the display panel 5 via, for example, an adhesive. The piezoelectric element 4 vibrates the display panel P1 with a touch panel in response to the drive signal SG6. As a result, the acoustic output function and the tactile feedback function are realized. That is, the piezoelectric element 4 is an example of an oscillator that generates sound by generating vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel.

As described above, since the piezoelectric element 4 is fixed to the display panel P1 with a touch panel, pressure is applied to the piezoelectric element 4 when the display panel P1 with a touch panel is pushed. The piezoelectric element 4 outputs a voltage generated according to the pressure applied to the piezoelectric element 4 itself to the subtractor 7 as a voltage signal SG7. That is, the piezoelectric element 4 is an example of a pressure detecting unit that detects the pressure applied to the display panel P1 with a touch panel.

The display panel 5 is, for example, an organic EL (Electro Luminescence) panel. The organic EL panel is in the form of a film and has flexibility. The display panel 5 displays an image based on the image signal SG3.

The touch panel 6 is arranged on the front surface (the surface on the operator side) of the display panel 5. In order to improve the visibility of the image displayed by the display panel 5, for example, OCA (Optical Clear Adhesive) or OCR (Optical Clear Resin) may be provided between the display panel 5 and the touch panel 6.

The touch panel 6 outputs the detection signal SG8 to the microcomputer 1. The detection signal SG8 is a signal indicating a contact state of the operating body, and includes information regarding the presence or absence of contact of the operating body with the touch panel 6. Further, when the operating body is in contact with the touch panel 6, the detection signal SG8 also includes information regarding the contact position.

The detection method of the touch panel 6 is not particularly limited, but the touch panel 6 is preferably a capacitance type touch panel. This is because the capacitive touch panel can detect not only the contact of the operating body with the touch panel 6 but also the proximity of the operating body with respect to the touch panel 6. When the touch panel 6 is a capacitive touch panel, the detection signal SG8 indicates not only the contact state of the operating body but also the proximity state of the operating body. In this case, the detection signal SG8 includes information regarding the presence / absence of proximity of the operating body to the touch panel 6. Further, when the operating body is close to the touch panel 6, the detection signal SG8 also includes information on the close position.

The subtractor 7 includes a third D / A converter and a subtraction circuit. In addition, unlike this embodiment, a third D / A converter may be provided on the DSP2 side so that the subtractor 7 receives the noise canceling acoustic signal SG5 which is an analog signal.

The third D / A converter of the subtractor 7 converts the noise canceling acoustic signal SG5, which is a digital signal, into an analog signal. The subtraction circuit of the subtractor 7 subtracts the noise canceling acoustic signal SG5 after being converted into an analog signal from the voltage signal SG7 to generate the voltage signal SG9, and outputs the voltage signal SG9 to the filter circuit 8.

The filter circuit 8 suppresses a predetermined band with respect to the voltage signal SG9 to generate the voltage signal SG10, pushes the voltage signal SG10, and outputs the voltage signal SG10 to the detection circuit 9.

The push detection circuit 9 detects the push to the display panel P1 with a touch panel based on the voltage signal SG10, and outputs the detection signal SG11, which is the detection result, to the microcomputer 1. For example, the push detection circuit 9 can be configured by a comparator. When the push-in detection circuit 9 is composed of a comparator, the push-in detection circuit 9 compares the level of the voltage signal SG10 with a predetermined threshold voltage by the comparator, and the level of the voltage signal SG10 is the predetermined threshold voltage Vth (FIG. 3 described later). If it is larger than (see), the detection signal SG11 is a high-level voltage signal, and if the level of the voltage signal SG10 is equal to or lower than a predetermined threshold voltage Vth, the detection signal SG11 is a low-level voltage signal. The high-level detection signal SG11 indicates that a push against the display panel P1 with a touch panel has been detected. On the other hand, the low-level detection signal SG11 indicates that the push to the display panel P1 with the touch panel is not detected.

<2. Operation example of acoustic output device>
FIG. 2 is a flowchart showing an operation example of the acoustic output device shown in FIG. FIG. 3 is a timing chart schematically showing waveform examples of various signals. Note that FIG. 3 is a timing chart of the period during which the sound output device shown in FIG. 1 is outputting sound, and the operating body changes from a state in which it is not in contact with the touch panel 6 to a state in which it is in contact with the touch panel 6. It is a timing chart from the time when the push to the display panel P1 with a touch panel is detected and the response by vibration tactile sensation is returned to the operating body.

In the flowchart shown in FIG. 2, the microprocessor 1 first determines whether or not the acoustic output device shown in FIG. 1 is producing acoustic output (step S10). When the acoustic signal output unit 1a outputs the acoustic signal SG1 to the DSP2, the acoustic output device shown in FIG. 1 is in the process of acoustic output. On the other hand, when the acoustic signal output unit 1a does not output the acoustic signal SG1 to the DSP2, the acoustic output device shown in FIG. 1 is not in the acoustic output.

When it is determined that the acoustic output device shown in FIG. 1 is not producing acoustic output (NO in step S10), the process proceeds to step S50, which will be described later.

On the other hand, when it is determined that the acoustic output device shown in FIG. 1 is in acoustic output (YES in step S10), the operation processing unit 1d touches the touch panel based on the detection signal SG8 output from the touch panel 6. It is determined whether or not it is in contact with 6 (step S20).

When it is determined that the operating body is not in contact with the touch panel 6 (NO in step S20), the DSP2 outputs the acoustic signal SG4 to the drive circuit 3 without controlling the acoustic signal SG4 (step S30).

On the other hand, when it is determined that the operating body is in contact with the touch panel 6 (YES in step S20), the DSP2 controls the acoustic signal SG4 and then outputs the acoustic signal SG4 to the drive circuit 3 (step S40). In the present embodiment, when the operation processing unit 1d determines that the operating body is in contact with the touch panel 6, it outputs a control signal CNT instructing to control the acoustic signal SG4 to the DSP 2. The control of the acoustic signal SG4 may be any control as long as it can reduce the feeling of strangeness (unpleasant tactile sensation) caused by the vibration of the acoustic output function to the operator. By such control, it is possible to reduce giving the operator a feeling of strangeness due to the vibration of the acoustic output function during the contact period T1 (the period during which the operating body is in contact with the touch panel 6) shown in FIG.

For example, DSP2 may execute control to reduce the entire band of the acoustic signal SG4. As a result, the vibration of the entire band of the display panel P1 with the touch panel due to the drive signal SG6 is reduced, so that it is possible to reduce giving the operator a feeling of strangeness due to the vibration of the acoustic output function. Note that reducing the entire band of the acoustic signal SG4 means reducing the level of the entire band of the acoustic signal SG4 as compared with the case where control is not executed.

Further, for example, DSP2 may execute control to reduce at least the first band of the acoustic signal SG4. As a result, the vibration of the first band of the display panel P1 with the touch panel due to the drive signal SG6 is reduced, so that it is possible to reduce giving the operator a feeling of strangeness due to the vibration of the acoustic output function. Further, since the band other than the first band of the acoustic signal SG4 is not reduced, the decrease in the volume of the acoustic output can be suppressed. Note that reducing the first band of the acoustic signal SG4 means reducing the level of the first band of the acoustic signal SG4 as compared with the case where control is not executed.

The tactile receptors of the human finger have the frequency characteristics shown in FIG. Therefore, it is desirable that the first band is a band of 500 Hz or less. This is because if the first band is a band of 500 Hz or less, it is possible to effectively reduce the feeling of discomfort caused by the vibration of the acoustic output function to the operator. Although it is set to 500 Hz or less here, it may be a band including the vicinity of 200 Hz, which is substantially the peak of the frequency characteristic of the finger, such as 300 Hz or less. Further, for example, a band including plus or minus 100 Hz centered around 200 Hz (a band of about 100 to 300 Hz) may be used.

Further, for example, DSP2 may execute control to amplify at least the second band of the acoustic signal SG4. As a result, the vibration of the second band of the display panel P1 with the touch panel due to the drive signal SG6 becomes large, so that the reduction of the vibration of the display panel P1 with the touch panel due to the contact of the operating body can be compensated. Further, since the band other than the second band of the acoustic signal SG4 is not amplified, it is possible to suppress an increase in the uncomfortable tactile sensation. Note that amplifying the second band of the acoustic signal SG4 means amplifying the level of the second band of the acoustic signal SG4 as compared with the case where the control is not executed. Further, the amplification amount in the second band may be changed according to at least one of the information regarding the level of the voltage signal SG10 and the contact position included in the detection signal SG8, for example. In this case, the DSP 2 may be configured to receive at least one of the voltage signal SG10 and the detection signal SG8, or the DSP 2 may receive an instruction regarding the amplification amount of the second band from the microcomputer 1.

The second band is preferably a band that does not include 500 Hz or less. This is because if the second band does not include 500 Hz, the band in which the tactile receptor of the human finger does not easily feel the tactile sensation is amplified, so that the increase in the uncomfortable tactile sensation can be effectively suppressed. Although it is set to 500 Hz or less here, it may be a band that does not substantially include the vicinity of 200 Hz, which is the peak of the frequency characteristic of the finger, such as 300 Hz or less. Further, for example, a band centered around 200 Hz and not including plus or minus 100 Hz (0 to about 100 Hz, and a band of about 300 Hz or more) may be used.

In the strict sense, the above-mentioned bandwidth does not mean that signals outside the bandwidth are not included at all, but for example, a 3 dB bandwidth or a 6 dB bandwidth commonly used in the fields of electrical engineering and communication engineering. It means a frequency in which the level of a signal outside the band frequency is substantially attenuated to the extent that it does not matter.

In step S30 or step S50 following step S40, the DSP2 outputs the noise canceling acoustic signal SG5. When the process of step S50 is completed, the process proceeds to step S60. Note that, unlike the present embodiment, when step S30 is executed, step S30 may be directly advanced to step S60 without executing step S50.

The noise canceling acoustic signal SG5 is a signal that is the same as the acoustic signal SG4, or a corrected acoustic signal (including a signal that differs only in gain from the acoustic signal SG4) obtained by correcting the acoustic signal SG4. Therefore, in the subtractor 7, the voltage signal SG7 output from the piezoelectric element 4 which is the pressure detection unit contains the antiphase signal of the acoustic signal SG4 or the antiphase signal of the corrected acoustic signal obtained by correcting the acoustic signal SG4. It is superimposed. Thereby, the noise component included in the voltage signal SG7 (the noise component caused by the vibration based on the acoustic signal SG4) can be canceled. Therefore, the accuracy of detecting the pressure applied to the display panel P1 with the touch panel is improved.

When the level of the drive signal SG6 is constant, the vibration amount of the display panel P1 with a touch panel usually differs depending on the frequency of the drive signal SG6 as shown in the example shown in FIG. Therefore, it is desirable that the corrected acoustic signal is a signal obtained by correcting the acoustic signal SG4 according to the vibration characteristics of the display panel P1 with a touch panel. This improves the accuracy of noise component cancellation. When the vibration characteristic of the display panel P1 with a touch panel is as shown in FIG. 5, the DSP2 multiplies the acoustic signal SG4 generated inside the DSP2 by a correction gain having the frequency characteristic as shown in FIG. The corrected acoustic signal may be generated. The DSP2 may non-volatilely store the frequency characteristics of the correction gain in the form of a relational expression or a data table. Further, it is desirable that the information stored in the DSP2 non-volatilely can be rewritten from the outside of the DSP2.

Then, in step S60, the filter circuit 8 suppresses a predetermined band with respect to the voltage signal SG9 output from the subtractor 7. The predetermined band is a band unnecessary for detecting the pressure applied to the display panel P1 with the touch panel, and may be matched with the vibration band (for example, 200 Hz or more) of the display panel P1 with the touch panel by the drive signal SG6, for example.

Although the acoustic output device shown in FIG. 1 is configured to include both the subtractor 7 and the filter circuit 8, the detection accuracy of the pressure applied to the display panel P1 with the touch panel by only one of the subtractor 7 and the filter circuit 8 is provided. Can be improved. Therefore, unlike the present embodiment, the acoustic output device may be configured to include only one of the subtractor 7 and the filter circuit 8.

In step S70 following step S60, the push-in detection circuit 9 determines whether or not push-in to the display panel P1 with a touch panel is detected based on the voltage signal SG10 output from the filter circuit 8.

If it is determined that the push to the display panel P1 with the touch panel has not been detected (NO in step S70), the process returns to step S10. On the other hand, when it is determined that the push to the display panel P1 with the touch panel is detected (YES in step S70), the tactile feedback signal output unit 1b drives the tactile feedback signal SG2 according to the instruction from the operation processing unit 1d. Is output to (step S80). When the process of step S80 is completed, the process returns to step S10.

<4. Notes>
The various technical features disclosed herein can be modified in addition to the above embodiments without departing from the gist of the technical creation. That is, it should be considered that the above embodiments are exemplary in all respects and are not restrictive, and the technical scope of the present invention is not the description of the above embodiments but the claims. It is shown and should be understood to include all modifications that fall within the meaning and scope of the claims.

For example, when the touch panel 6 can also detect the proximity of the operating body to the touch panel 6, the acoustic output device shown in FIG. 1 may operate as shown in the flowchart shown in FIG. 7, for example. The flowchart showing FIG. 7 is obtained by replacing step S20 with step S21 in the flowchart showing FIG.

In step S21, the operation processing unit 1d determines whether or not the operating body is in close proximity to or in contact with the touch panel 6 based on the detection signal SG8 output from the touch panel 6.

When it is determined that the operating body is neither close to nor in contact with the touch panel 6 (NO in step S21), the process proceeds to step S30. On the other hand, if it is determined that the operating body is close to or in contact with the touch panel 6 (YES in step S21), the process proceeds to step S40. Therefore, when the acoustic output device shown in FIG. 1 performs the operation of the flowchart shown in FIG. 7, the acoustic signal SG4 is controlled even before the operating body comes into contact with the touch panel 6 as shown in FIG.

When the acoustic output device shown in FIG. 1 performs the operation of the flowchart shown in FIG. 3, there is a slight delay between the contact of the operating body with the touch panel 6 and the start of control of the acoustic signal SG4, so that the acoustic output is produced. There will be a very short period of time during which it is not possible to reduce the feeling of discomfort caused by the vibration of the function to the operator. On the other hand, when the acoustic output device shown in FIG. 1 performs the operation of the flowchart shown in FIG. 7, it is possible to eliminate the period during which it is not possible to reduce the feeling of discomfort caused by the vibration of the acoustic output function to the operator.

In the acoustic output device shown in FIG. 1, for example, the process of step S40 shown in FIG. 2 or 7 may not be performed. In this case, it is not possible to obtain the effect of reducing the feeling of discomfort caused by the vibration of the acoustic output function to the operator, but it is possible to obtain the effect of improving the detection accuracy of the pressure applied to the display panel P1 with the touch panel. be able to.

A first mode in which the process of step S40 shown in FIG. 2 or 7 is performed and a second mode in which the process of step S40 shown in FIG. 2 or 7 is not performed are provided, and the first mode and the first mode are provided. The two modes may be selected by operating the acoustic output device shown in FIG.

Further, in the present embodiment, the piezoelectric element 4 is both a vibrator that generates vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel to generate sound and a pressure detection unit that detects the pressure applied to the display panel P1 with a touch panel. However, the vibrator that generates sound by generating vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel and the pressure detection unit that detects the pressure applied to the display panel P1 with a touch panel are separate parts. May be good. For example, the vibrator that generates sound by generating vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel may be an actuator other than a piezoelectric element such as a vibration solenoid or a vibration motor, and the pressure applied to the display panel P1 with a touch panel. The pressure detection unit that detects the above may be a sensor other than the piezoelectric element such as a strain gauge.

Further, in the present embodiment, a vibrator that generates vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel to generate sound and a vibrator that generates vibration based on the tactile feedback signal SG2 on the display panel P1 with a touch panel are used. Both are piezoelectric elements 4, but an oscillator that generates vibration based on the acoustic signal SG4 on the display panel P1 with a touch panel to generate sound, and a vibrator that generates vibration based on the tactile feedback signal SG2 on the display panel P1 with a touch panel. May be a separate oscillator. When using different oscillators, a plurality of oscillators of the same type may be used, or different types of oscillators may be used.

Further, in the present embodiment, the acoustic output device is configured to include the display panel P1 with a touch panel, but the acoustic output device may be configured not to include the display panel. When the acoustic output device is configured not to have a display panel, vibration based on an acoustic signal is generated on a touch panel (a touch input device generally called a "touch pad") that does not face the display panel. ..

1 microcomputer 2 DSP
3 Drive circuit 4 Piezoelectric element 5 Display panel 6 Touch panel 7 Subtractor 8 Filter circuit 9 Push-in detection circuit

Claims (9)

Touch panel and
A vibrator that generates sound by generating vibration based on an acoustic signal on the touch panel.
A control unit that controls to reduce at least the first band of the acoustic signal during the period in which the contact of the operating body with the touch panel is detected by the touch panel.
An acoustic output device. The acoustic output device according to claim 1, wherein the control unit controls the acoustic signal even during a period in which the proximity of the operating body to the touch panel is detected by the touch panel. The acoustic output device according to claim 1 or 2 , wherein the first band is a band having an upper limit of 500 Hz or less. The acoustic output device according to any one of claims 1 to 3 , wherein the control unit controls at least to amplify the second band of the acoustic signal. The acoustic output device according to claim 4 , wherein the second band is a band that does not include a band having an upper limit of 500 Hz or less. A pressure detection unit that detects the pressure applied to the touch panel,
A superimposition unit that generates a superimposition signal by superimposing the anti-phase signal of the acoustic signal or the anti-phase signal of the corrected acoustic signal obtained by correcting the acoustic signal on the output signal of the pressure detection unit.
A push detection circuit that detects a push against the touch panel based on the superimposed signal, and a push detection circuit.
The acoustic output device according to any one of claims 1 to 5, further comprising. The superimposing unit superimposes the anti-phase signal of the corrected acoustic signal on the output signal of the pressure detecting unit.
The acoustic output device according to claim 6 , wherein the corrected acoustic signal is a signal obtained by correcting the acoustic signal according to the vibration characteristics of the touch panel. The acoustic output device according to any one of claims 1 to 7 , further comprising a display panel facing the touch panel. It is an acoustic output method using a touch panel.
A vibration process in which vibration based on an acoustic signal is generated on the touch panel to generate sound, and
A control step of performing control to reduce at least the first band of the acoustic signal during the period in which the contact of the operating body with the touch panel is detected by the touch panel.
An acoustic output method.

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